A look at the weighted underlying holdings of the iShares FTSE NAREIT Mortgage Plus Capped Index Fund (REM) shows an impressive 24.7% of holdings on a weighted basis have experienced insider buying within the past six months. Start slideshow:10 ETFs With Stocks That Insiders Are Buying Arbor Realty Trust Inc (ABR), which makes up 0.24% of the iShares FTSE NAREIT Mortgage Plus Capped Index Fund (REM), has seen 3 directors and officers purchase shares in the past six months, according to the recent Form 4 data.